Heating furnace



Feb. 18, 1930. w. T. BRADLEY HEATING FURNACE Filed Nov. 23. 192"! 2- Slieets-Sheet l INVENTOR. I William T fiFdJZ y LM 5% v ATTORNEY.

Feb; 18, 1930.

w. 1'. BRADLEY HEATING FURNACE Filed Nov. 23. 1927 2 Sheets-Sheet 2 .2 VEN TOR.

m'zzzzm 7. BY

ATTORNEY, I

Malay Patented Feb. '18, 1930 UNITE STATES WILLIAM T. BRADLEY, OFST. LOUIS, MICHIGAN HEATING ronnnon Application filed November 23, 1927. Serial No. 235,152.

The present invention relates to heating furnaces of the steam, vapor or hot water type and has among its objects to increase the efiiciency of such furnaces by improving combustion of the fuel, and by promoting the passage of the combustion heat to the water.

Another object is a furnace of the type mentioned in which a greater proportion of 1 the heat generated is absorbed by the water.

Other objects will readily appear to those skilled in the art upon reference to the following description and accompanying drawing in which Fig. 1, is a longitudinal vertical section through the furnace as if upon line 1-1 of Fig. 2.

Fig. 2, is a section on line AA of Fig. 1.

Fig. 3, is a plan view of the bottom of the firing chamber.

Fig. 4, is a front elevation of the furnace with a portion of the smoke dome removed.

Fig. 5, is a portion of the rear elevation of the furnace.

As indicated in the drawing, the furnace comprises a housing 10 having a vertical front wall provided with a charging door 11, a draft door 12, and an ash removing door 13. The rear wall of the housing 14 slopes toward the front and the top of the housing is capped by a dome shaped member 15 hav; ing at its rear side a flue 16 leading to the chimney. The rear wall 14 may be provided with suitable clean out doors 17 intermediate its height and an additional clean out door 18 near its lower end.

It is preferred to make the triangular portion at the bottom of the housing with substantially vertical walls 20 as one unit and the upper portion containingthe elements to be described, as a second unit with the grate member as a separate element interposed between the two and supported on the lower unit.

The grate member is shown more in detail in Figuresl, 2 and 3, and consists of a hollow body 25 having in one half, openings for the grate bars 26, suitable bosses being provided for the support of the grates. The

grate openings will divide that portion of the member 25 into several tubular portions 25 communicating at one end with the imperforate or water table part 25 of member 25 and at the other end with a header 27. In mounting themember 25, the imperforate portionis placed at the upperend of unit 20 and forms a hearth portion for the fuel preliminary to its passage to the grates 26.

Mounted upon the unit 20 and member 25 is the semi cylindrical boiler member 30, which at its lower end merges into a vertical portion 31 adapted to rest on the header 27 and communicates therewith through the ports 32. v

The upper end 33 of the boiler 30 is closed 5 except for steam or water outlets 34 and is formed into a dome. The space enclosed by the inner boiler wall 35 of the semi-cylindrical boiler 31 communicates at the upper end of the boiler with the flues 36 which are 10- 7o cated to one side and somewhat below the level of the main boiler portion. These flues 36 are separated from the upper part of the housing above the boiler by means of lateral flanges 37.

This arrangement of lines causes the travel of gases from the draft door 12 through the grate bars 26 up withinthe inner wall 35 of the boiler'and into the passages 36 to the lower end of the boiler and into the housing 14 where they pass along the outer wall 38 of the boiler to the flue 16;

In order to promote the passage of heat from the combustion gases into the water in the main boiler portion, the boiler walls 35 5 and 38 are provided with fins 40 which extend from the walls into the chambers containing the hot gases, thereby presenting to such gases a very much greater heat absorbing area than if such walls were smooth.

The flow of water through the furnace is into the water inlets 45 leading into the hearth member 25 down through the latter into header 27 and then into boiler 30 where it is vaporized or heated and passes into the radiator system through the outlets 34.

In the operation of the furnace, fuel is fed upon the hearth portion 25 to the unit 25 and down upon, the grates where the main portion of the combustion takes place. The v products of combustion or gaseous products in the combustion pass up over the fresh fuel on hearth 25 and the combustion also takes place on the hearth but from the top rather than from the bottom as from the grates. This provides for preheating of the fresh fuel and initiating of the combustion therein so that the efficiency of the combustion of the fuel is increased.

Incidentally, the water in water table 25 and tubes 25 will be preheated so that it arto lead combustion products from the grate portion under said arch, over said hearth and longitudinally over the outer surface of said arch, and means for admitting water to said hollow hearth.

WILLIAM T. BRADLEY.

rives in the'boiler at a somewhat elevated temperature.

In order to permit the firing of the furnace conveniently, a damper 50 is provided opposite the flue 16 in the dome portion 15. This damper is linked through the links 51 and lever 52 to the firing door 11 so that when the latter is open, the flue is also open to the passage of gases directly from the fire into the flue rather thaninto passages 36.

Further, in order to prevent accumulation of ash on the central tubular portion 25 of unit 25, this may be provided with a ridge 25', as indicated best in Figure 2 and for draining the boiler, the usual drain pipe and cock 60 will be provided.

Now having described the invention and the perfected form of embodiment thereof, it is to be understood that the said invention is to be limited not to the specific details therein described and illustrated, but only by the scope of the claims which follow.

I claim 1. A heating furnace comprising a grate member consisting of a hollow imperforate hearth portion, a header and an interposed grate portion with tubular portions supporting grate bars and connecting the hearth por tion and header, a boiler arched over said grate member and connected to said header, fins extending inwardly from the inner surface of said arch, fins extending outwardly from the outer surface of said arch, flues arranged longitudinally of said boiler and connected in series and adapted to lead combustion products from the grate portion under said arch, over said hearth and longitudinally over the outer surface of said arch, and means for admitting water to said hollow hearth.

1 2. A heating furnace comprising a grate member consisting of a hollow imperforate hearth portion, a header and an interposed grate portion with tubular portions supporting grate bars and connecting the hearth portion and header, means for mounting said member in an inclined position with the hearth portion uppermost, a boiler arched over said grate member and connected to said header, fins extending inwardly from the inner surface of said arch, fins extending outwardly from the outer surface of said arch, flues arranged longitudinally of said boiler and connected in series and adapted 

